Welcome to HCM.
It is called dysfunctional uterine bleeding
,Most likely it is due to hormonal
disturbance.Sometime overwork,anxiety,diet,other disease also affects.
Start haemetinics,Take more liquids like lemon water,fruit juices.
Take NSAID to subside body ache
,fever. Ondencetrone or domperidon to subside nausea.
Go for investigations like CBC,urine,USG and consult your physician for better medical management.